
    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>Producer和Consumer的工作流程 - 交互式测验</title>
      <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');
        
        body {
          font-family: 'Noto Sans SC', sans-serif;
          background-color: #f4f7f9;
          color: #333;
          display: flex;
          justify-content: center;
          align-items: center;
          min-height: 100vh;
          margin: 0;
          padding: 20px;
          box-sizing: border-box;
        }
        
        .main-wrapper {
            position: relative;
            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .quiz-container {
          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
          width: 100%;
          max-width: 700px;
          overflow: hidden;
          z-index: 10;
        }

        .quiz-header {
          background-color: #4a90e2;
          color: white;
          padding: 20px 30px;
          text-align: center;
        }

        .quiz-header h1 {
          margin: 0;
          font-size: 24px;
          font-weight: 700;
        }
        
        .quiz-header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
        }

        #progress-indicator {
            height: 100%;
            width: 0%;
            background-color: #4caf50;
            border-radius: 5px;
            transition: width 0.3s ease;
        }

        #question-container {
          margin-bottom: 20px;
        }

        #question-text {
          font-size: 18px;
          font-weight: 500;
          line-height: 1.6;
          margin-bottom: 25px;
        }

        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
          background-color: #f8f9fa;
          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        
        #next-btn {
            background-color: #28a745;
        }

        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
        }
        
        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
        }

        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
        }

        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
        }
        
        .result-box h3 {
            margin-top: 0;
        }

        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
        }
        
        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        .score-card p {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
            color: #333;
        }
        .score-details table {
            width: 100%;
            font-size: 16px;
        }
        .score-details td {
            padding: 4px 0;
        }
        .score-details td:last-child {
            text-align: right;
            font-weight: 700;
        }
        .report-actions button {
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 8px;
            padding: 12px 25px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 10px;
            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
        }
        .report-actions button:hover {
            background-color: #f1f1f1;
            border-color: #bbb;
            transform: translateY(-2px);
        }
        .report-actions button.primary {
            background-color: #28a745;
            color: white;
            border-color: #28a745;
        }
        .report-actions button.primary:hover {
            background-color: #218838;
        }
        
        .hint-container {
            background-color: #e0f7fa;
            border: 1px solid #b2ebf2;
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>Producer和Consumer的工作流程 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "根据文档，Producer在与Broker通信之前，必须先执行哪个关键步骤来定位到正确的Broker？",
    "options": [
      "直接向一个预设的Broker地址发送消息",
      "与NameServer建立连接，获取Topic的路由信息",
      "向所有已知的Broker广播消息，等待响应",
      "从本地配置文件中读取固定的Broker IP列表"
    ],
    "correctAnswerIndex": 1,
    "explanation": "NameServer在系统中扮演着“注册中心”和“路由中心”的角色。Producer在启动初始化阶段，其核心任务之一就是连接NameServer，并根据自己想要发送的Topic名称，从NameServer获取该Topic的详细路由信息。这些信息包括Topic的消息队列分布在哪些Broker上以及这些Broker的具体地址，从而为后续的消息发送提供准确的目标。",
    "source": "文档中「Producer发送消息的完整流程」的「启动初始化阶段」部分，以及「关键交互点详解」的「消息路由获取」部分",
    "hint": "文档中提到，Producer和Consumer都需要从一个中心化组件获取Topic所在的Broker地址等信息。"
  },
  {
    "question": "文档中描述的Consumer“Push模式”其底层的真实实现机制是什么？",
    "options": [
      "Broker主动建立TCP长连接，实时将消息推送给Consumer",
      "一种长轮询（Long Polling）机制，由Consumer发起请求并等待消息",
      "Consumer定期（如每秒）向Broker发送一次拉取请求（短轮询）",
      "使用UDP广播，Broker将消息广播给子网内所有Consumer"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档明确指出，所谓的“Push模式”实际上是基于长轮询机制实现的。Consumer主动向Broker发起拉取消息的请求，如果Broker当前没有新消息，该请求会被挂起（hold）一段时间，而不是立即返回空结果。一旦有新消息到达或等待超时，Broker才会将结果返回给Consumer。这种方式既能达到准实时推送的效果，又避免了短轮询造成的网络开销和CPU浪费。",
    "source": "文档中「Consumer接收和处理消息的步骤」的「消息拉取」部分",
    "hint": "在文档的“消息拉取”部分，对“Push模式”的描述后面有一个括号里的关键解释。"
  },
  {
    "question": "当一个Producer采用“单向发送（One-way）”模式发送消息时，以下哪个描述是正确的？",
    "options": [
      "Producer会等待Broker返回一个确认信息，但不会处理它",
      "Producer发送消息后会立即返回，不关心发送结果，性能最高",
      "Producer会阻塞线程，直到消息被成功持久化到Broker磁盘",
      "Producer会通过一个异步回调函数来接收发送成功或失败的通知"
    ],
    "correctAnswerIndex": 1,
    "explanation": "“单向发送”模式是一种“发后即忘”的通信方式。Producer将消息请求发送给Broker后，不会等待任何响应，也不会有任何回调。这种方式的优点是网络开销极小，发送效率最高。它适用于那些对消息可靠性要求不高的场景，例如日志收集，允许少量消息丢失。",
    "source": "文档中「Producer发送消息的完整流程」的「消息发送过程」部分",
    "hint": "在描述三种发送模式时，其中一种被定义为“只发送消息，不关心发送结果”。"
  },
  {
    "question": "关于消费位点（Offset）的管理，文档中描述的集群消费和广播消费模式有何核心区别？",
    "options": [
      "集群模式下位点由消费者本地文件管理，广播模式下由Broker统一管理",
      "集群模式下所有消费者共享一个位点，而广播模式下每个消费者都独立管理自己的位点",
      "集群模式下位点保存在Broker端，而广播模式下位点保存在消费者本地",
      "集群模式下消费位点是自动提交的，广播模式下需要手动提交"
    ],
    "correctAnswerIndex": 2,
    "explanation": "消费位点记录了消费进度。在集群模式下，一个Topic的消息被分发给同一个消费组内的多个消费者实例共同消费，为了确保消息只被消费一次，消费进度必须集中管理，因此位点被持久化在Broker端。而在广播模式下，消息会被投递给消费组内的每一个消费者实例，每个实例都需要消费全量消息，因此它们各自独立维护自己的消费进度，将位点保存在自己的本地。",
    "source": "文档中「Consumer接收和处理消息的步骤」的「位点管理」部分",
    "hint": "文档的“位点管理”一节分别说明了集群模式和广播模式下位点的保存位置。"
  },
  {
    "question": "当一条消息被Consumer消费失败并经过多次重试后仍然失败，系统最终会如何处理这条消息？",
    "options": [
      "将消息直接丢弃，并记录一条警告日志",
      "将消息退还给Producer，并告知其发送失败",
      "将消息放入“死信队列”，等待人工干预",
      "无限期地重试该消息，直到消费成功为止"
    ],
    "correctAnswerIndex": 2,
    "explanation": "为了防止个别有问题的消息无限次重试，从而阻塞整个消息队列的正常消费，系统引入了死信队列（Dead-Letter Queue）机制。当一条消息达到预设的最大重试次数后，如果依然消费失败，它将被从原始队列中移出，并投递到一个特殊的“死信队列”中。开发或运维人员可以订阅此队列，对这些“死信”消息进行分析、排错和人工处理。",
    "source": "文档中「关键交互点详解」的「重试与死信机制」部分",
    "hint": "在文档末尾的“重试与死信机制”中提到，多次重试失败后的消息会进入一个特殊的队列。"
  },
  {
    "question": "Consumer成功处理完一批消息后，为了防止系统重启或故障后重复消费这些消息，它必须执行的关键操作是什么？",
    "options": [
      "向NameServer报告消费完成",
      "通知Producer消息已成功处理",
      "从本地磁盘删除已处理的消息缓存",
      "向Broker提交（更新）消费位点（Offset）"
    ],
    "correctAnswerIndex": 3,
    "explanation": "提交消费位点是实现消费确认（ACK）的核心机制。当Consumer成功处理消息后，它需要向Broker报告自己已经消费到了哪个位置（即更新Offset）。Broker会记录这个位点。这样一来，即使Consumer实例发生崩溃重启，它也可以从Broker获取上次提交的位点，并从下一条消息开始继续消费，从而确保了消息的“至少一次”消费语义，并有效避免了大规模的重复消费。",
    "source": "文档中「Consumer接收和处理消息的步骤」的「ACK确认」部分",
    "hint": "“ACK确认”一节描述了消息处理成功后需要执行的动作，这个动作是关于进度的。"
  },
  {
    "question": "在集群消费模式下，当一个新的Consumer实例加入或一个旧的实例下线时，会触发什么机制来保证负载均衡？",
    "options": [
      "Broker会停止向所有Consumer发送消息，直到手动配置完成",
      "Producer会收到通知，并重新选择Broker进行发送",
      "触发重新负载均衡（Rebalance），重新为所有Consumer分配消息队列",
      "系统会自动创建一个新的Topic来服务新的Consumer"
    ],
    "correctAnswerIndex": 2,
    "explanation": "为了实现消费能力的水平扩展和高可用，系统支持动态调整Consumer实例数量。当消费组内的Consumer数量发生变化（增加或减少）时，会触发重新负载均衡（Rebalance）机制。该机制会重新计算，并将Topic下的所有消息队列（MessageQueue）公平地分配给当前存活的Consumer实例，确保每个实例的负载大致相当。",
    "source": "文档中「关键交互点详解」的「消息队列分配」部分",
    "hint": "在“消息队列分配”的解释中，提到了当Consumer数量变化时会触发的一个关键动作。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  